Assessment of human-structure interaction on a lively lightweight GFRP footbridge

Ahmadi, Ehsan; Caprani, Colin C.; Živanović, Stana; Heidarpour, Amin

doi:10.1016/j.engstruct.2019.109687

Cited by 27 publications

(16 citation statements)

References 32 publications

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“…Different from the HSI on footbridges, 36,37 the walking directions of pedestrians are diverse on the composite floor. To research the above problem, the following combinations of walking directions (as shown in Figure 8) are considered.…”

Section: Comparison and Discussionmentioning

confidence: 99%

Formulation of human–structure interaction for vibration serviceability of steel–concrete composite floors

Cao

Chen

2020

Struct Control Health Monit

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Summary In this paper, an analytical model representing the human–structure interaction (HSI) system of steel–concrete composite floors under human vibrations is described and discussed. In the theoretical analysis, the human and composite floor are idealized as the subsystems represented by a linear oscillator model and the anisotropic rectangular plate, respectively. The analytical formula for the natural frequency and acceleration response of a steel–concrete composite floor with various boundary conditions and HSI is proposed. For analyzing the natural frequencies, the human subsystem can be treated as a structural system with added mass, damping, and stiffness. The proposed analytical solution on the acceleration response is based on the combined weighted residual and perturbation method, which is simple to be implemented and can avoid the cumbersome numerical calculations. The theoretical solutions are validated with the experimental results. A sensitivity study utilizing the analytical solution was also conducted to investigate the effects of walking frequency, occupant weight, sprung mass, equivalent damping ratio, occupant natural frequency, and occupant spacing on the natural frequency and peak acceleration.

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Section: Comparison and Discussionmentioning

confidence: 99%

Formulation of human–structure interaction for vibration serviceability of steel–concrete composite floors

Cao

Chen

2020

Struct Control Health Monit

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“…Accurate estimation of human-induced vibration in footbridges may also require taking HSI into account [4,27,28]. In the modeling of HSI, the human body in a walking posture is usually modeled as a SDoF mass-damper-spring system [4,[29][30][31][32].…”

Section: Parameter Mean Value Covmentioning

confidence: 99%

Sensitivity Analysis for Pedestrian-Induced Vibration in Footbridges

et al. 2022

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This paper aims to provide a novel insight into the influence of uncertainties in system- and pedestrian-induced load parameters on the vibration response of footbridges. The study begins with a sensitivity analysis for the vertical vibration response of a representative footbridge to two loading cases: a single pedestrian and a crowd. Two methods are utilized: the Sobol’-based global sensitivity analysis method and the local sensitivity analysis method. Uncertainties in all model parameters (which include bridge and human body dynamics in a walking posture, as well as dynamic force generated by humans) are considered in stochastic response estimation. Parametric analysis is then performed to investigate the influence of the variation of the mean values of the bridge modal mass, damping ratio, and natural frequency on the results of global and local sensitivity analysis. Systematic comparison of the results of global and local sensitivity analysis is performed to identify their similarities and differences. It has been found that the sensitive parameters and their importance ranking strongly depend on bridge modal properties and loading scenarios (i.e., a single pedestrian or a crowd crossing). The damping ratio and natural frequency of the human body are found to be the only two insensitive parameters. Therefore, they could be treated as deterministic parameters in the stochastic estimation of human-induced vibration. Global sensitivity analysis is recommended as a choice for the sensitivity analysis of pedestrian-induced vibration of footbridges as it leads to more reliable results, owing to the advantage of characterizing model sensitivity over the entire input spaces.

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“…Furthermore, due to the low weight of the GFRP web-core footbridges, the non-structural mass of pedestrians on the bridge deck will play an important role in the overall vibration behaviour of the footbridge. Human-structure interaction [28][29][30][31][32] is a well-known phenomenon in which the dynamics of the two subsystems interact and they start to influence each other. Due to this interaction, certain dynamic properties, i.e.…”

Section: Introductionmentioning

confidence: 99%

Measured dynamic properties of web-core sandwich panel FRP composite footbridges and their relation to pedestrian comfort analysis

Uyttersprot

Corte

2021

Composite Structures

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This paper reports experimental data for the dynamic properties (i.e. first fundamental flexural frequency, damping ratio, comfort class) of ten web-core sandwich panel FRP composite footbridges in Belgium, which contributes to the assessment of relevant input parameters for design and assessment of this promising bridge type, quickly gaining popularity in recent years. The data is gathered based on smartphone accelerometers, enabling easy, quick, affordable, and abundant measurements, while at the same time yielding reliable experimental values. Given the relatively short spans, the heel and excitation test methods are used, rather than the ambient vibration method. The tests indicate damping ratios of one to three percent, which are strongly dependent on the number of people on the bridge during the measurement. Additionally, comfort analysis tests with up to 58 people (0.5 P/m²) were conducted on five out of the ten bridges. The results indicate that the current design guidelines for pedestrian comfort analysis are overconservative and do not reflect the effect of pedestrian-induced damping, which is especially apparent for this bridge type given its very low modal mass and relatively low damping ratio.

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Assessment of human-structure interaction on a lively lightweight GFRP footbridge

Cited by 27 publications

References 32 publications

Formulation of human–structure interaction for vibration serviceability of steel–concrete composite floors

Formulation of human–structure interaction for vibration serviceability of steel–concrete composite floors

Sensitivity Analysis for Pedestrian-Induced Vibration in Footbridges

Measured dynamic properties of web-core sandwich panel FRP composite footbridges and their relation to pedestrian comfort analysis

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